a couple questions

1. So my friend just recently got a tenor sax, Ive already learned how to transpose and play on a few scales together. I was wondering if anyone knew of any decent sax/bass songs for us to learn to get a better feel of playin with each other before we move on to other ventures?

2. I have on old 4 string silvertone layin around that needs a new neck on it. How hard would it be to convert it to a 5 string while i have it taken apart? i know ill need a 5 string neck and a new bridge with longer pick ups. also is it possible to get it to have the spacing of a 4 string?